May Be You will find these Sites and Links Helpful
http://taj.chass.ncsu.edu/lessons.html ("A Door Into Hindi", an excelent introduction).
http://www.ispeakhindi.com/ ("I Speak Hindi", it has several levels: beginner, intermediate, etc., and it also has many translated sentences).
http://iils.org/pdf/ModernHindiGrammar.pdf (Modern Hindi Grammar, author: Omkar N. Koul; a very interesting book, with only a defect: the conjugation is scarcely shown).
Plus You can ask as many doubts and questions as you like here too we will try to help you out :)
Best of Luck
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